Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Theory: Molecular Dynamics

MO 20.3: Talk

Thursday, March 26, 2015, 15:15–15:30, PH/SR106

Influence of vibrations on the energy transfer in Fenna-Matthews-Olson complex — •Xiaomeng Liu and Oliver Kühn — Institut für Physik, Universität Rostock, D-18051, Germany

We have numerically calculated the effect of vibrational modes on the exciton quantum coherence and energy transfer dynamics of the FMO complex, employing the experimental spectral density from Ref. [1]. The exciton Hamiltonian is restricted to the single excitation space of the seven site FMO model [2]. Particular emphasis is laid on the way, explicit vibrational motions are included. Here, one- (OPA) and two-particle approximations (TPA) are compared. The dynamics is analyzed by means of a Markovian quantum master equation [3]. We examined the influence of vibrations on the populations and coherences, for different values of the Huang-Rhys factor and the temperature. We found that decoherence and equilibration is faster in the TPA, where vibrational motion in the electronic ground state is included.

[1] Wendling, M. et al., J. Phys. Chem. B 104, 5825(2000)

[2] Schmidt am Busch, M. et al., J. Phys. Chem. 2, 93(2011)

[3] Kühn, O. et al., Chem. Phys. 204, 99(1996)